Only Dex stat can be rolled for dual wield.Damage from Second Attack is non crittable.Second Attack has a -2 to the roll after innate attack bonus is applied.Innate Damage can only be added once to totalStr bonus dmg is never added.Techs can only be used on the First roll.

Dual Wielding Innate Abilities

When Dual Wielding weapons that provide separate powers and skills, bonuses to damage only apply to the weapon in question unless otherwise stated.

Bonuses to Attack or Defense are most commonly universal to all actions performed by the Dual Wielder, regardless of which weapon is being used.

Consider: A Dual Wielder might gain +2 Attack which applies to all attacks because it's the wielder that's being enhanced. However, only one weapon does added fire damage, because only one weapon is on fire.

How Do I Get a Dual Wielder?

Bear in mind that Dual Wielding requires DM Approval prior to use, and usually in the form of a Special Character Concept.